I don't think the investigations do very often "reveal truth" as you say, I think it's as I put it, a plausible naturalistic explanation is sometimes all you get but that's enough for many.
agree that that is not a reasonable expectation and that some forces are sporadic. My question however, remains. Why is the whole idea more plausible than the employment of natural forces?
If you actually do accept the phenomena called psychic, that is, the knowing of something you couldn't know by normal means, just by definition I don't see how you could explain it naturalistically. (Strictly speaking I don't think psychic knowledge is "supernatural" however, if it exists it would be a function of the mind and therefore natural. But it would still involve knowing something in a direct way that we don't normally experience.)